Hello,
 
Yes we could use a map as a select tool,  if you use this script inclusion you can have a google map:
 
<script type='text/javascript' src='//maps.googleapis.com/maps/api/js?key=AIzaSyDk5GAuE90XyWkdOkez0IwVnvFVZ_RduHA'></script>
Then you make a div to put the map in, add icons to the map, and set click events for the icons.  Attached GMapFront.unpacked.zip might be a reasonable place to start.  I can help you work on that, probably next week.
 
To make a download file, build up a comma separated string of values while you are looping through doing calculations, and then assign it to a $_SESSION variable.
 
i.e.:
$csv = "";
foreach($result as $row)
{
  $eto = somecalculation();
  $etr = someothercalculation();
  $csv .= $eto.",".$etr."\n";   
}
$_SESSION['csvFileName'] = "download.csv";
$_SESSION['csvData'] = $csv;
 
And then have a download data form with a button on it something like this: 
 
(the $retVal is just building up the form, and then it is echoed, sorry for the hackish code)
 
  $retVal .= "<form name='CsvOutputForm' class='noprint' method='post' action='/utils/CsvOutput.php' style='display:inline'>".PHP_EOL;
  $retVal .= "<script type='text/javascript'>";
  $retVal .= " function confirmDownload() { ";
  $retVal .= " if(confirm(\"Please confirm you are ready to download the data by clicking in the affirmative.\")) { ";
  $retVal .= " return true; ";
  $retVal .= " } else {  ";
  $retVal .= " return false; ";
  $retVal .= " } " ;
  $retVal .= " } " ;
  $retVal .= "</script> ";
 
  $retVal .= "<input name='csvFile' type='hidden' value='".$_SESSION['csvFileName']."' />".PHP_EOL;
  $retVal .= "<input onclick='if(this.value == \"Download Data\") { if(confirmDownload()) { document.CsvOutputForm.submit(); } return false; } else {alert(\"Sorry, the system is still preparing data for download. This feature is normally available in 60 seconds or less.  The button will update to show Download Data when the current output is available.  Please contact AWN if you would like further assistance.\")}' id='downloadbutton' name='downloadbutton' type=button value='Processing...'>".PHP_EOL;
  $retVal .= "</form>".PHP_EOL;
 
 
 
You will notice that the "action" is /utils/CsvOutput.php, which is also included in the .zip file and should be able to prompt the user to save the file.
 
Ummm...   Oh the button by default has a label of "Processing..." and is updated to "Download Data" by the following bit of code, which is wrapped in a $(document).ready which makes it happen after the page has been completly drawn on the users screen (otherwise the .csv file data may not be available, depending ...)   Jquery is required.
 
  $retVal .= "$(document).ready(function(){  ";
  $retVal .= "$(function() { ".PHP_EOL;
        $retVal .= " document.CsvOutputForm.downloadbutton.enabled=true;".PHP_EOL;
        $retVal .= "document.CsvOutputForm.downloadbutton.value = 'Download Data';".PHP_EOL;
  $retVal .= "  }  ".PHP_EOL;
  $retVal .= "}) ;".PHP_EOL;
 
Again, sorry about the $retVal stuff...  I can help clean this up together next week!